*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #0f0f2a;
  --bg-card: #141432;
  --bg-card-hover: #1a1a40;
  --bg-sidebar: #08081a;
  --bg-code: #0d0d22;
  --border: #1e1e4a;
  --border-light: #2a2a5a;
  --text-primary: #e8e8f0;
  --text-secondary: #9898b8;
  --text-muted: #606088;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --green: #22c55e;
  --yellow: #eab308;
  --blue: #3b82f6;
  --gray: #52526e;
  --red: #ef4444;
  --sidebar-w: 260px;
  --header-h: 72px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --radius: 10px;
}

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse 800px 600px at 20% 10%, rgba(99, 102, 241, 0.05), transparent),
    radial-gradient(ellipse 600px 400px at 80% 80%, rgba(34, 197, 94, 0.03), transparent);
  pointer-events: none;
  z-index: 0;
}

/* ---- Header ---- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(15, 15, 42, 0.92);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.header-left { display: flex; align-items: center; gap: 14px; }
.header-logo {
  width: 36px; height: 36px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #818cf8);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.75rem; color: white; letter-spacing: -0.02em;
  flex-shrink: 0;
}
.site-header h1 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; white-space: nowrap; }
.site-header h1 span { color: var(--accent); }
.site-header .subtitle { font-size: 0.78rem; color: var(--text-secondary); display: none; margin-left: 8px; }
.header-meta { display: flex; align-items: center; gap: 16px; font-size: 0.75rem; color: var(--text-muted); }
.header-badge {
  background: var(--accent-glow); color: var(--accent);
  padding: 3px 10px; border-radius: 12px; font-weight: 600;
  border: 1px solid rgba(99,102,241,0.3);
}
.hamburger {
  display: none; background: none; border: none; color: var(--text-primary);
  font-size: 1.5rem; cursor: pointer; padding: 4px 8px;
}

@media (min-width: 900px) {
  .site-header .subtitle { display: inline; }
}

/* ---- Sidebar ---- */
.sidebar {
  position: fixed; top: var(--header-h); left: 0; bottom: 0;
  width: var(--sidebar-w); background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto; padding: 20px 0; z-index: 90;
  transition: transform 0.3s ease;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 2px; }

.sidebar a {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 20px; font-size: 0.82rem; color: var(--text-secondary);
  text-decoration: none; transition: all 0.15s;
  border-left: 3px solid transparent;
}
.sidebar a:hover { color: var(--text-primary); background: var(--bg-card); }
.sidebar a.active { color: var(--accent); border-left-color: var(--accent); background: var(--accent-glow); }
.sidebar .dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.sidebar .nav-label {
  padding: 18px 20px 6px; font-size: 0.65rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text-muted); font-weight: 600;
}
.sidebar .nav-label:first-child { padding-top: 0; }

/* ---- Overlay ---- */
.sidebar-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.5); z-index: 85;
}
.sidebar-overlay.show { display: block; }

/* ---- Main ---- */
.main {
  margin-left: var(--sidebar-w); margin-top: var(--header-h);
  padding: 36px 40px 80px;
  max-width: 960px;
  position: relative; z-index: 1;
}

/* ---- Section ---- */
.section {
  margin-bottom: 56px;
  opacity: 0; transform: translateY(12px);
  animation: fadeInUp 0.4s ease forwards;
}
@keyframes fadeInUp {
  to { opacity: 1; transform: translateY(0); }
}
.section:nth-child(2) { animation-delay: 0.05s; }
.section:nth-child(3) { animation-delay: 0.1s; }
.section:nth-child(4) { animation-delay: 0.15s; }

.section-header {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 20px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.section-header h2 { font-size: 1.35rem; font-weight: 700; }

.status-badge {
  font-size: 0.65rem; font-weight: 600; padding: 3px 10px;
  border-radius: 10px; text-transform: uppercase; letter-spacing: 0.04em;
  white-space: nowrap;
}
.status-badge.decided { background: rgba(34,197,94,0.15); color: var(--green); border: 1px solid rgba(34,197,94,0.3); }
.status-badge.in-progress { background: rgba(234,179,8,0.15); color: var(--yellow); border: 1px solid rgba(234,179,8,0.3); }
.status-badge.not-started { background: rgba(82,82,110,0.25); color: var(--gray); border: 1px solid rgba(82,82,110,0.4); }
.status-badge.implemented { background: rgba(59,130,246,0.15); color: var(--blue); border: 1px solid rgba(59,130,246,0.3); }

/* ---- Card ---- */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px 26px; margin-bottom: 16px;
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--border-light); }
.card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 10px; color: var(--text-primary); }
.card p, .card li { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; }
.card ul { padding-left: 20px; }
.card ul li { margin-bottom: 4px; }
.card ul li::marker { color: var(--accent); }
.card code {
  background: var(--bg-code); padding: 2px 6px; border-radius: 4px;
  font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent);
}

/* ---- Note ---- */
.note {
  background: var(--accent-glow); border: 1px solid rgba(99,102,241,0.25);
  border-radius: 8px; padding: 14px 18px; font-size: 0.82rem;
  color: var(--text-secondary); margin-top: 12px;
}
.note strong { color: var(--accent); }

/* ---- Table ---- */
.tbl-wrap { overflow-x: auto; margin-bottom: 12px; }
table {
  width: 100%; border-collapse: collapse; font-size: 0.85rem;
}
th {
  text-align: left; padding: 10px 14px; font-weight: 600;
  border-bottom: 2px solid var(--border-light); color: var(--text-secondary);
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em;
}
td {
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}
tr:hover td { background: var(--bg-card-hover); }

/* ---- Diagram Placeholder ---- */
.diagram-placeholder {
  background: var(--bg-card); border: 2px dashed var(--border-light);
  border-radius: var(--radius); padding: 48px 24px; text-align: center;
  color: var(--text-muted); font-size: 0.85rem; margin: 16px 0;
}

/* ---- Links ---- */
a.ref-link {
  color: var(--accent); text-decoration: none; font-size: 0.85rem;
  border-bottom: 1px solid rgba(99,102,241,0.3);
  transition: border-color 0.15s;
}
a.ref-link:hover { border-color: var(--accent); }

.link-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px; margin-top: 12px;
}
.link-card {
  display: block; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 16px 18px; text-decoration: none;
  transition: all 0.15s;
}
.link-card:hover { border-color: var(--accent); background: var(--bg-card-hover); }
.link-card .lc-title { font-size: 0.88rem; font-weight: 600; color: var(--accent); margin-bottom: 4px; }
.link-card .lc-desc { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }
.link-card .lc-url { font-size: 0.72rem; color: var(--text-muted); }

/* ---- Roadmap / Timeline ---- */
.timeline { position: relative; padding-left: 28px; margin-top: 16px; }
.timeline::before {
  content: ''; position: absolute; left: 8px; top: 0; bottom: 0;
  width: 2px; background: var(--border-light);
}
.tl-item { position: relative; margin-bottom: 22px; }
.tl-item::before {
  content: ''; position: absolute; left: -24px; top: 6px;
  width: 12px; height: 12px; border-radius: 50%;
  border: 2px solid var(--border-light); background: var(--bg-primary);
}
.tl-item.active::before { border-color: var(--accent); background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.tl-item h4 { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); }
.tl-item p { font-size: 0.8rem; color: var(--text-muted); }

/* ---- Domain Grid ---- */
.domain-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px; margin-top: 12px;
}
.domain-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px 16px; font-size: 0.82rem;
  color: var(--text-secondary);
}
.domain-box strong { display: block; color: var(--text-primary); margin-bottom: 4px; font-size: 0.85rem; }

/* ---- Feature Checklist ---- */
.feature-group { margin-bottom: 14px; }
.feature-group h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 8px; color: var(--accent); }
.feature-list { list-style: none; padding: 0; }
.feature-list li {
  padding: 6px 0; font-size: 0.84rem; color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 8px;
}
.feature-list li::before { content: '\25CB'; color: var(--text-muted); font-size: 0.7rem; }

/* ---- Placeholder ---- */
.placeholder {
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  padding: 40px 20px;
}

/* ---- Loading Indicator ---- */
.loading-section {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.loading-section .spinner {
  display: inline-block;
  width: 20px; height: 20px;
  border: 2px solid var(--border-light);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Footer ---- */
.site-footer {
  margin-left: var(--sidebar-w); padding: 24px 40px;
  border-top: 1px solid var(--border); font-size: 0.75rem;
  color: var(--text-muted); display: flex; justify-content: space-between;
  position: relative; z-index: 1;
}

/* ---- Progress Bar ---- */
.progress-bar {
  display: flex; gap: 12px; margin-top: 12px; flex-wrap: wrap;
}
.progress-item {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.78rem; color: var(--text-secondary);
}
.progress-dot {
  width: 10px; height: 10px; border-radius: 50%;
}
.progress-dot.decided { background: var(--green); }
.progress-dot.in-progress { background: var(--yellow); }
.progress-dot.not-started { background: var(--gray); }

/* ---- Mobile ---- */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); width: 280px; }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; padding: 24px 18px 60px; }
  .site-footer { margin-left: 0; padding: 20px 18px; flex-direction: column; gap: 4px; }
  .hamburger { display: block; }
  .site-header { padding: 0 12px; }
  .site-header h1 { font-size: 1rem; }
  .header-meta { gap: 8px; }
  .header-badge { font-size: 0.65rem; padding: 2px 8px; }
  .header-meta span:not(.header-badge) { display: none; }
  .header-logo { width: 30px; height: 30px; font-size: 0.65rem; }
}